If all you have to replace is the seal in the tail housing of the tranny it should be a piece of cake. Since its a RWD car all youd have to do is drop the drive shaft from the rear axle, pull it out of the tranny, use a seal puller ( $10.00 ) to pop out the old seal, install the new seal carefully, reinstall the drive shaft and top off with tranny fluid ( Dextron III I think for that year of ford ) and your done... Someone familiar with cars should have no problem doing it in under an hour, maybe less. If it where my car and I had the seal, it wouldliteraly take me 25 minutes tops. Should only be 4 bolts/nuts holding the driveshaft to the axle yoke. The driveshaft pulls straight out of the tranny. Even though its a 4 cyl engine, alot of them used the same automatic the 6 and 8 cyl used.